Here's how I've implemented it:
inits' :: [a] -> [[a]]
inits' [] = [[]]
inits' xs = inits'(init xs) : xs
I get this error:
• Couldn't match type ‘a’ with ‘[[a]]’
‘a’ is a rigid type variable bound by
the type signature for:
inits' :: forall a. [a] -> [[a]]
Expected type: [[[a]]]...
This class will load a file with INI configuration elements and cache them, it then has a method to get an item from the cache if it needs to.
internal class ConfigHandler
{
private static readonly ILogger Logger = LogManager.GetCurrentClassLogger();
private Dictionary<string, string> _...
I have made an async function in TypeScript that responds to Events and returns an object with methods that return a promise. I would like help making it better and prettier. :)
My interface files,
config.model.ts
export interface IDBUConfigModel {
version: number;
dbName: string...
I have created this Store Procedure, but I do not like to repeat same query. I do it because each query, depending on the conditions, use different parameters.
DELIMITER $$
DROP PROCEDURE IF EXISTS getOrganizationLightList$$
CREATE PROCEDURE getOrganizationLightList(IN mtuser_id int, IN organi...
This is a program that generates a random hex value.
# How this works:
# uses random to get a random number
# checks what hash method to use
# uses that method to hash the random number
# returns the value
import hashlib
import random as rand
def hexrandom(minint, maxint, shamode="s...
i have created mvc application for booking space. in this for booking user can applied coupon for booking.
i have implemented one coupon service and validate coupon.
public class Coupon
{
public int ID { get; set; }
public string Name { get; set; }
public string Description { get; ...
Hiding Fields in Javascript inheritance like Java, C++, C# and many other programming languages.
Why? Please consider following example:
var Base = function() {
this.name = "Base";
};
Base.prototype.getName = function() {
return this.name;
};
var Derived = function() {
Base.call(th...
I have written a code in Haskell that calculates the determinant of a matrix using the laplace expansion.
As I have just started learning Haskell, I would like some opinions on how well (structured) the code is written and where I could be able to boost the performance.
This is the code:
det ::...
Matrix Spiral Copy. I got this interview question and I was wondering if I can get some code review.
def spiral_copy(inputMatrix):
output = []
m = len(inputMatrix)
n = len(inputMatrix[0])
end_right = n - 1
end_left = 0
end_top = 0
end_bottom = m - 1
while end...
Problem description:
Design and implement a data structure for Least Recently Used (LRU)
cache. It should support the following operations: get and put.
get(key) - Get the value (will always be positive) of the key if the
key exists in the cache, otherwise return -1. put(key, value) ...
I wrote a program which finds the shortest path between a source and a destination in a graph, so that the path will be to one with th least number of edges. In order to write it, I used Dijkstra's algorithm with several modifications.
Is there any way to improve or modify my code?
#include<st...
I am doing a filtered table in react, and I came up with the following code:
import React from 'react';
import { render } from 'react-dom';
import RowFilter from './RowFilter';
import List from './List';
import movieList from './movielist.json';
const data = movieList;
const App = () => (
<Ro...
I have a task to connect to S3 get a JSON file with the names of artists, use the youtube-data-api and search for the top 10 songs.
Then send it back in a given format to S3 back.
console.log("Loading up the best code ever!!!");
//packagess import
var fs = require('fs');
var AWS = require('aws-...
I am creating an application that will upload a file in the web. There are three services: login, upload and logout. All of it sends request and receives response which I put in a DTO. Model has all the logic, while view has the UI. Controller connects the model and view.
Above are the fiel...
I am trying to write the exact c code for an algorithm written in java. The original java algorithm is here. It is a sorting (suffix array induce sorting) algorithm. I wrote its c version, but not getting its exact output. I've included 4 files: bwt.c bwt.h input commented_Java_Code.
On executi...
I need to retrieve a file from a website every minute that contains boats location.
Than I parse the file, delete all the boats from my database and create all of them at the new position indicated on the file.
Here's my code so far in the server.js of my loopbackjs app:
var CronJob = require(...
I have following code which gets MastrSegments from repository(entity framework). It's working but I think I am violating DRY (though not sure).
MastrSegments conatins collection of SegReqs and SegReq contains collection Routes. And I am looping through them to update RootObject
foreach (v...
Hi All I implement CustomHashMap in Java, and would like to know Is my approach is correct or not.
below I am sharing complete code of my CustomHashMap:
CustomHashMap.java
import java.util.Iterator;
import java.util.Objects;
import com.custom.utils.*;
public class CustomHashMap<K, T> implemen...
I'm trying to make a first game. I would like to make memory Game where you have to find a color matched field.
I made:
MemoryGame - JFrame where i added mainPanel.
In mainPanel i added two another panel becouse both have other layout.
The most of the game code is in ButtonsPanel class. Code in...
The scenario:
An asker posts a question.
A low rep user notices some improvements to the questions code, and edits them into the question.
The edit gets accepted in the review queues.
Another user notices the site policy invalidation and rolls back the edit.
All seems to be well, as the post ...
i've write this simple code, that is possible to find on my github profile: https://github.com/Gillis86/twitter-data-mining (it simply download some twitter data and store in an excel file)
it is one of my first experiment of using OOP in python: the code works (do its stuff as intendend) but may...
I have written this class for matrix inversion and some other linear algebra. I tried to use LU decomposition and forward, backward substitution in order to measure the inverse of my matrix. The speed of code is good, but somehow the elements of the inverted matrix are mixed up and I could not fi...
The task is to create three child processes from the mother process:
P1 - read the strings from standard input and sends it to P2 through message queue (K1);
P2 - takes the string from the message queue (K1) and send it through pipe to P3 (K2);
P3 - takes the string from the pipe (K2) and print...
How can I improve my code/layout?
I haven't been able to use many semantic tags because they don't like to be nested inside the main .grid div. Is it possible for me to not wrap all of the content in the .grid div and instead add the class of .div to anything I want to be a div child?
Also, on ...
def mergeCount(left,right,invCount):
inversionCount = invCount
# print(left,right)
for right_item in right:
offset = 0
insertState = False
for i in range(len(left)):
if left[i] <= right_item:
offset += 1
elif left[i] > right_item:
inversionCount += le...
I'm writing a Sudoku solver in Ruby to complete a coding challenge with the following restrictions.
Failing to follow the following restrictions will result in an invalid
submission:
Do not create classes, you will only be creating (many) methods.
No instance variables and no glob...
Consider the following function:
def __get_info(self,df_tmp,colname):
newlist=[]
newlist.append(df_tmp[colname].mean() if not df_tmp.empty else 'NA')
newlist.append(df_tmp[colname].var() if not df_tmp.empty else 'NA')
newlist.append(df_tmp[colname].max() if not df_tmp.empty else ...
I am looking for feedback on my code, how I can simplify some operations, use more efficient methods or other best practices. This is my first web scraping project.
The goal here is to scrape a dentist's page for reviews and export to csv. I have not solved the issue with infinite scrolling, bu...
I'm trying to practice OO design as well as OOP in Java so I've created an Exam system that tries to be Object Oriented and expandable.
This is what I haven't learned from Java so far: Java 8, interfaces, Collections, IO, Swing, exceptions
public abstract class Question {
protected int score...
I've always used a Config class to store and retrieve configuration settings within my applications, but I'm not sure what it is but I've just never really liked this method of doing it for some reason.
class Config {
/**
* Development environment
* @var boolean
*/
c...
I recently needed a data structure with FIFO queue semantics that supported efficient bulk-insertion (often need to enqueue thousands of messages at once). I took a look at Purely Functional Data Structures, and I didn't find an exact match, but it looked like the BatchedQueue could be easily en...
Problem:Implement a queue class in Python: It should support 3 APIs:
queue.top(): prints current element at front of queue
queue.pop(): takes out an element from front of queue
queue.add(): adds a new element at end of queue
class Queue:
def __init__(self):
"""ini...
I am needing to get a sanity check to make sure I am setting up my model and viewmodel correctly. I believe what I have is correct even though I have seen some documentation that shows different ways this can be done. I posted two examples of my code bellow. Any hints or suggestions are always ap...
So I have code as below
var reported_psdArray = [];
$("select[name=reported_psd]").each(function() {
var item = {"id": $(this).attr('id'),"value": $(this).val(),"text": $("option:selected", this).text()};
reported_psdArray.push(item);
})
reported...
I am trying to write a class that defines latitude and longitude in C++ using boost::units and normalized spheroidal coordinates. I want to throw an exception if the class is constructed outside the bounds of the normalized spheroidal coordinates. Incidentally I thought about using boost::geome...
import random
import string
length_of_pass = int(input("How long do you want the password to be? "))
# the four variables below are the components/characters to make up ascii _____
lowercase = string.ascii_lowercase
uppercase = string.ascii_uppercase
numbers = "0123456789"
special = "!#$%&’()*+,...
A little bit of background here... In my school there is an online poll among different dorms, and the dorm that get the most votes will get a special prize. The poll seemed innocent at first, but it quickly turned into a coding competition. I am quite familiar with java and was able to use Selen...
Often we need to find out if two tuples, or two packs in general, are the same as each other up to permutation. If there are no repeat types, then implementing is_permutation_no_repeats is quite straightforward. For example, simply remove each type in the first pack from the second pack and che...
